Frustulia soror

Graeff and Kociolek 2011      Category: Symmetrical biraphid
BASIONYM: Frustulia soror Graeff and Kociolek 2011

REPORTED AS: Frustulia weinholdii (Patrick and Reimer 1966) 

Frustulia saxonica

 

Frustulia vulgaris

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Carrie Graeff - October 2011
Length Range: 28.5-52.0 µm
Width Range: 7.5-9.5 µm
Striae in 10 µm: 34-36 at the center, 35-37 at the ends

Description

Valves are linear-lanceolate with slightly rostrate rounded apices. The striae are parallel or slightly radiate at the valve center, parallel along the length of the valve and convergent at the ends. Areolae comprising the striae are round or oval. An isolated, or elongated, poroid is sometimes present at the central area. The central area is relatively linear in shape. Elongated areolae may be present in a transverse depression (SEM feature) found at the external raphe ends. Internally, the areolae are occluded. The raphe branches are curved slightly. Internally, the longitudinal ribs terminate before reaching the helictoglossae. Internally, at the central area a longitudinal rib is incomplete on one side of the raphe and completed on the other.

F. soror is a species that has been separated from the broad taxon concept of F. weinholdii established by Patrick and Reimer (1966) where they described the apices of F. weinholdii as round to capitate. At least two additional species have since been separated from F. weinholdii, including those populations with capitate apices. Under the broad concept of the taxon, reports of F. weinholdii have been numerous in the United States.



Original Description

Basionym: Frustulia soror
Author: Graeff and Kociolek 2011
Length Range: 28.5-52.0 µm
Width Range: 7.5-9.5 µm
Striae in 10 µm: 34-36 at the center, 35-37 at the ends

Original Description

Valves linear-lanceolate with slightly rostrate rounded apices. The striae are parallel or slightly radiate at the valve center, parallel along the length of the valve, and convergent at the ends of the valve. Areolae comprising the striae are round or oval. An isolated or elongated poroid is sometimes present at the relatively linear central are. Elongated areolae can be present in the transverse depression found at the external raphe ends. Internally, the areolae are occluded.The raphe branches are curved slightly. Internally, the longitudinal ribs terminate before reaching the helictoglossae. At the internal central area, the dorsal longitudinal rib is incomplete and the ventral rib is complete. Details of the cingulum are unknown.

Original Images


Cite This Page:
Graeff, C. (2011). Frustulia soror. In Diatoms of the United States. Retrieved August 29, 2014, from http://westerndiatoms.colorado.edu/taxa/species/frustulia_soror

Species: Frustulia soror

Contributor: Carrie Graeff

Reviewer: Sarah Spaulding

Citations

Graeff, C.L. and Kociolek, J.P. (2011). Investigations of the Frustulia weinholdii species complex with descriptions of three new species, F. capitata, F. latita, and F. soror from South Carolina and Hawaii. Proceedings of the Academy of Natural Sciences of Philadelphia 161: 43-59.

Wallace, J. (1960). New and variable diatoms. Notulae Naturae 331: 1-8.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion